Saxaphone first is spelled wrong and second is not a normal part of the orchestra.
Cornet and Euphonium are not a normal parts of the orchestra, they are primarily band instruments
Contrabassoon and Bass Trombone would be more appropriate than any of those
Bells or Glockenspiel would be more appropriate than Marimba
2 each of flutes, oboes, clarinets, bassoons with a 3rd of each added for piccolo, bass clarinet, english horn, and contrbassoon
4 horns, 2 trumpets, 3 trombones, 1 tuba
Strings can be any where from 14-18 1st violins and 2nd violins, 10-14 violas, 12-16 cellos, 8-10 string basses, and harp if needed.